Corner dressing means for grinding wheels



July 31, 1962 H E. BALSIGER 3,046,967

CORNER DRESSING MEANS FOR GRINDING WHEELS Filed April 3, 1959 2 Sheets-Sheet 1 INVENTOR HAROLD EBALSIGER ATTORNEY July 31, 1962 H. E. BALSIGER CORNER DRESSING MEANS FOR GRINDING WHEELS 2 Sheets-Sheet 2 Filed April 3, 1959 ATTORNEY United States. Patent 3,046,967 CORNER DRESSING MEANS FOR GING WI-EELS Harold E. Balsiger, Waynesboro, Pa. assignor to Landis Tool Company, Wayneshoro, Pa. Filed Apr. 3, 1959, Ser. No. 803,933 3 Qlaims. (Cl. 125-11) This invention relates to dressing tools for abrasive wheels, particularly for wheels having corners or other angular portions which must be rounded to blend with adjacent straight portions.

Previous devices for this purpose generally consisted of one or the other of two types of dressing devices, namely, a single or multiple diamond tool guided by a template or profile bar, or rollers formed to a desired shape and made of hardened materials suitable for crush dressing or diamond impregnated rollers for diamond dressing. All of these previous devices were subjected to relatively rapid wear and, therefore, required frequent adjustment or replacement of wearing parts to maintain the required shape.

It is, therefore,-an object or" this invention to provide a dressing tool which may be mounted on a conventional dresser bar and which will be capable of providing a substantially greater number of dressing operations before it is sufliciently worn to require replacement.

Another object is to provide dressing tools consisting of diamond impregnated or hardened rollers having a formed peripheral surface which is not necessarily the form to be dressed on the abrasive Wheels.

Another object is to provide a dressing tool having a formed dressing roller which may be angularly positioned to dress curved surfaces of different radii on the grinding wheel.

Another object is to provide means for efiecting rotation of said roller by means other than contact of the roller with the rotating abrasive wheels.

FIGURE 1 is a partial sectional front elevation of a dressing device for dressing the corner of a grinding wheel.

FIGURE 2 is a partial front elevation with the dressing rollers in an a'ngularly adjusted position for dressing a small radius.

FIGURE 3 is a partial front elevation of a dressing roller in zero position.

FIGURE 4 is a partial front elevation of a dressing roller in adjusted position for dressing a larger radius than that shown in FIGURE 2.

In the drawing, numeral 10 is the housing for the dresser. 11 is a dresser bar slidably mounted in housing 10. 12 is an auxiliary bar mounted in an ofi center bore 13 in bar 11. Bar 12 has a threaded portion 14 and a nut 15. A horizontal slot 16 in bar 11 provides means for adjusting bar 12 axially in bar 11. Nut 15 may be locked in adjusted position by a wedge-shaped member 17 actuated by screw 18.

At the lower end of each of the bars 11 and 12, there is attached a pair of dressing tool supports 20 and 21. Each of said dressing tool supports 20 and 21 has a carrier member 22 or 23 slidably mounted in a radial dove-tail guide 24 or 25. Each of said carrier members 22 or 2.3 has a pair of concentric bores 26 and 27 in carrier member 22, and 28 and 29 in carrier member 23. The axes of said bores are inclined inwardly toward grinding wheel W at an angle approximately to the axis of dresser bar 11 or the plane of grinding wheel W. While the 35 angle is preferred, other angles are not excluded.

The apparatus of the devices mounted in said bores are identical in construction. Therefore, the rest of the specification will be directed to a single device.

It consists of a tool supporting member 36 having concentric cylindrical portions 31 and 32 corresponding to bores 26 and 27 respectively in carrier member 22. Tool supporting member 30 is held in carrier member 22 by means of screw 35. Member 30 may be held in a predetermined angular position by means of set. screw 36. Member 30 has two depending portions 40 and 41 to which shaft 42 is attached by means of screws 43 and 44 and cap member 45.

In bore 26, there is a peripheral groove 46 in line with a plurality of radial passages 47 in portion 31. Groove 46 is also connected to a longitudinal passage 50 in depending portion 41. Passage St) is connected to passage 52 in shaft 42. Passage 52 is, in turn, connected to collar 53 on shaft 42 between a pair of anti-friction bearings 54 and 55. Collar 53 serves as a spacer for the inner rings of said bearings 54 and 55. The outer rings are spaced by a ring-like member 56. Collar 53 has a plurality of radial passages 57 peripherally spaced therein. Bearings 54 and 55 provide a rotatable supporting means for a roller supporting element 69 on which dressing roller 61 is clamped by means of clamping member 62 and clamping screws 63. The peripheral surfaces of the roller supporting element 66 and clamping member 62 are roughened either by knurling 64 or other suitable means. The peripheral surface of dressing roller 61 is concave having a radius preferably greater than the maximum radius to be dressed on the corner of grinding wheel W. Dressing roller 61 may be impregnated with diamonds for diamond dressing 'or may he of a carbide material for crush dressing.

A mixture of lubricant and air under pressure is introduced into groove 46. A portion of said mixture is distributed through passage 50 and radial passages 57 to lubricate bearings 54 and 55. Another portion of said mixture is directed through radial passages 47 from which it is directed at high velocity on to the knurled peripheral surfaces 64 and 65 of the roller supporting element 60 and clamping member 62 to rotate dressing roller 61 at speeds suitable for engaging the grinding wheel W for diamond dressing or for crush dressing.

By changing the angular position of tool supporting member 30 in carrier member 22, roller 61 will dress a different radius on grinding wheel W. A chart may be prepared showing the radius which may be dressed for each angular position of tool supporting member 30. For example:

Radius of wheel corner,

Roller setting-degrees: inches I claim:

1. A dressing device for dressing 2 corner of a grinding wheel comprising a housing, a dresser bar slidably mounted in said housing for movement toward and from said grinding wheel, a carrier mounted on said dresser bar for adjustment relative to said grinding wheel, a tool supporting member mounted for angular adjustment in said carrier, a dressing roller rotatably mounted in said tool supporting member, said dressing roller having a concave peripheral surface of a radius greater than the radius of said grinding wheel corner, means for effecting preliminary rotation of said dressing roller comprising knurled collars on each side of said dressing roller, and means for directing high velocity streams of air against said collars.

2. A dressing device for a grinding wheel comprising a housing, a dresser bar mounted in Said housing for move-,-

Pate'nted July 31, 1962 I 3 d ment-toward and from said grinding wheel, a tool holder means for directing a high velocity stream of air against r mounted on said dresser bar, a dressing roller rotatably said surface. a I mounted in said tool holder, means for efiecting preliminary rotation of said dressing roller comprising a knurled ReferellEeS sited in 319 file of this P surface on said dressing roller, and means for directing a 5 UNITED STATES PATENTS high velocity stream of air against said knurled surface.

3. A dressing device fora grinding wheel comprising a 2158423 Hufi May 1939 housing, a dresser bar mounted in said housing for move- 2360127 Harley '7 1944 ment toward and from said grinding wheel, a dressing FOREIGN PATENTS roller rotatably mounted on said dresser bar, means for 10 594 556 Great Britain Nov 13 1947 efiecting preliminary rotation of said dressing roller com- France 1952' prising a roughened surface on said dressing roller, and 

